Matttcattt said:
Matttcattt, open a new thread with your question.
People are two busy discussing other things and may have missed it.
And for future search on the forum it's easier with a new thread.
Re: Matching
As far as matching goes; I always use chips with the same batch-code. They seem to behave very identical
😉
zygibajt said:
As far as matching goes; I always use chips with the same batch-code. They seem to behave very identical
😉
Hi,
I fired up my Gainclone yesterday.Everything seems to be allright.I have three diffrent pairs of speakers.One of them are Altec 891A,two way studio monitors.When I hooked them up they started cracking.They play the music but crack.Only when listened very silent they don't.I was investigating what is happening and figured that the couse was a speaker cable (quite expensive one,figh capacity-about 1nF per meter).Exchanged cable and everything works fine.It happens only with Altec's.Other speakers don't crack with this cable.Also when I unplug one of the Altecs from GC there is no cracking and I can listen as loud as I want.Is it possible that GC is so sensitive? But why there is no cracking when only one speaker is connected.There is no diffrance which channel and which speaker.
I used 800VA ,2*19VAC tr.,25A single bridge,2,2uF coupling cap ,220K feedback resistor.Also I have DIY Aleph P preamp so instead of 50K pot I put 47K resistor to ground.
Dc offset is about 50mV ,same in both channels.
Do You have any idea why does it crack?
Bartek
I fired up my Gainclone yesterday.Everything seems to be allright.I have three diffrent pairs of speakers.One of them are Altec 891A,two way studio monitors.When I hooked them up they started cracking.They play the music but crack.Only when listened very silent they don't.I was investigating what is happening and figured that the couse was a speaker cable (quite expensive one,figh capacity-about 1nF per meter).Exchanged cable and everything works fine.It happens only with Altec's.Other speakers don't crack with this cable.Also when I unplug one of the Altecs from GC there is no cracking and I can listen as loud as I want.Is it possible that GC is so sensitive? But why there is no cracking when only one speaker is connected.There is no diffrance which channel and which speaker.
I used 800VA ,2*19VAC tr.,25A single bridge,2,2uF coupling cap ,220K feedback resistor.Also I have DIY Aleph P preamp so instead of 50K pot I put 47K resistor to ground.
Dc offset is about 50mV ,same in both channels.
Do You have any idea why does it crack?
Bartek
zygibajt said:
Bartek,
Wow that was fast... wasn't it just the other day, you were asking if i thot this was a good idea to try 🙂
And welcome to the forum.
dave
im post for 2 reasons:
1) to keep this thread alive
2) to tell everyone about my website
http://www.freewebs.com/matttcatttweb/index.htm
any comments?
1) to keep this thread alive
2) to tell everyone about my website
http://www.freewebs.com/matttcatttweb/index.htm
any comments?
Matttcattt said:
On your site you mention building GC for a car amp. But what do you do about voltage regulation?
Or do you use the simple 0-14.4 V voltage swing of a car? In that case the National LM chips would not work because they must have a +- supply, whereas the OPA chips will work (but I think that you use them).
But with 0-14.4 V you waste a lot of potential of these amp chips, since most of them are designed to work up to 80 V voltage swing...
And how will you stabilize the voltage? Simply with filter caps? I do not think that the solution will be sufficient...
If building a chip amp for a car I would stick to those chips now commonly used inside car stereo units... and not those for home use...
Bye,
Arndt
i am going to use 2 car batteries to get approx. +/- 14v. i am using the OPA541 and OPA549 chips, which can run from as low as +/-4v.
I have some opa 541`s coming today...now I have to find a transformer suitable for them..its going to be a toss up on these or the 3886 or the stk 4042 that I have
Matttcattt said:
I don't know why, I can't see the picture every time I linked to your site. However, I can copy the link and open it on spearate explorer
S.C said:
I don't know why, I can't see the picture every time I linked to your site. However, I can copy the link and open it on spearate explorer
I can't see your pictures whatever I try...
mike
Hi,
Strange...I am using IE6.0 SP1 + a whole raft of sandbag updates on Win2K and have no problem whatsoever.
If you guys want that page in a different format I can convert it to *.doc (MS Office 2000) or *.PDF (you'll need Acrobat Reader for that, free at adobe.com).
Just send me a e-mail through the forum and I'll mail it to you.
Cheers,😉
Strange...I am using IE6.0 SP1 + a whole raft of sandbag updates on Win2K and have no problem whatsoever.
If you guys want that page in a different format I can convert it to *.doc (MS Office 2000) or *.PDF (you'll need Acrobat Reader for that, free at adobe.com).
Just send me a e-mail through the forum and I'll mail it to you.
Cheers,😉
it should work... the files are hosted here: http://www.laserarray.com/ftp.cgi?a...DIO/;right=/;order-left=name;order-right=name
i will try hosting them with the site that hosts my page...
i will try hosting them with the site that hosts my page...
zygibajt said:
Hi,
Your amp oscillates, IMHO.
Place Zobel network on amp output terminals.
Regards
Hi,
At a nanoF/m this to be expected....can't imagine any half sane cable designer putting such a crazy cable onto the market.
A well designed OPT coupled tube amp would drive that without going belly up but that's about it.
It'll still be on the brink of stability and I doubt it would solve it entirely...beter than nothing, I agree.
Cheers,😉
At a nanoF/m this to be expected....can't imagine any half sane cable designer putting such a crazy cable onto the market.
A well designed OPT coupled tube amp would drive that without going belly up but that's about it.
It'll still be on the brink of stability and I doubt it would solve it entirely...beter than nothing, I agree.
Cheers,😉
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